lkml.org 
[lkml]   [2007]   [Sep]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH -mm] Don't truncate /proc/PID/environ at 4096 characters
On Wed, 19 Sep 2007, Mikael Pettersson wrote:
> H. Peter Anvin writes:
> > Mikael Pettersson wrote:
> > > Does /proc/PID/mem even work? If I do `strace cat /proc/PID/mem > /dev/null'
> > > for a known good PID, the first read() from /proc/PID/mem fails with ESRCH,
> >
> > Of course it does. Address zero isn't typically mapped.
>
> Indeed. My bad :-(

No, not quite. Peter explains why "cat /proc/self/mem" gets EIO,
but you were seeing "cat /proc/other/mem" get ESRCH: that's from
the stringent !MAY_PTRACE || !ptrace_may_attach checks.

Hugh
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-09-19 21:33    [W:0.043 / U:0.140 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site